CN104691786B - A kind of propellant management device in propellant tank - Google Patents
A kind of propellant management device in propellant tank Download PDFInfo
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- CN104691786B CN104691786B CN201510008141.2A CN201510008141A CN104691786B CN 104691786 B CN104691786 B CN 104691786B CN 201510008141 A CN201510008141 A CN 201510008141A CN 104691786 B CN104691786 B CN 104691786B
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Abstract
A kind of propellant management device in propellant tank, including centre strut, guide vane, prop-fan, big blade, storage liquid blade, top board, upper net plate, upper supporting plate, small column, skeleton, lower platen, lower net plate, lower carrier plate；Guide vane, prop-fan, big blade be the most radially fixed to be arranged on centre strut thus forms an overall structure, described overall structure is fixedly mounted on top board by centre strut, prop-fan and big blade are installed in same plane, and the mounting plane of guide vane is at a certain angle with the mounting plane of big blade；Storing liquid blade radial to be fixedly mounted on top board, top board, upper net plate, upper supporting plate, small column, skeleton, lower platen, lower net plate, lower carrier plate fixedly mount the most successively thus form an overall structure i.e. accumulation liquid module.The present invention has suppression liquid sloshing function, and operation on orbit is applied widely, can realize ground and repeat large flow rate filling.
Description
Technical field
The present invention relates to a kind of propellant management device in propellant tank, particularly one be used for pushing away
Enter the novel propellant management device with suppression liquid sloshing function in agent tank, belong to spacecraft
Middle propelling field.
Background technology
Propellant tank, with its high reliability under weightlessness and long-life feature, is widely used in defending
On the various spacecrafts such as star, airship, space station, carrier rocket.The core technology of propellant tank is
The propellant management device (being called for short PMD) that it is internal.The operating capability of PMD is the key index of tank performance.
The target of PMD design is that PMD at any time can reliably, bubble-freely carry liquid.
At present, the PMD of propellant tank Chinese Space aircraft especially satellite used is most
Net formula, use screen cloth be capillary element to collect propellant, and by pipeline by propellant energy properties to propelling
Agent tank liquid outlet.But along with the development of Space Cause, the office of such propellant management device
Sex-limited the most gradually reveal, become a unfavorable factor of restriction China satellite career development.Net formula PMD
There are some following shortcomings: such as, wicking mesh structures intensity is low, easy damaged, easily pollute, reliability low,
Meanwhile, need arrange complexity fluid delivery channel, cause propellant management device weight bigger than normal, filling speed
Degree is slow.
From the point of view of practical situation in orbit, some satellites each stage is the most motor-driven more frequent, needs
Propellant tank provides stable sufficient and not gas enclosure propellant for thruster, in this requires propellant tank
PMD realizes management complete to propellant.Meanwhile, require higher, at machine due to whole star attitude control accuracy
During Dong, propellant tank is as the bigger parts of quality, needs to rock propellant tank internal liquid to adopt
Take braking measure.Therefore need to use simple in construction, there is suppression liquid sloshing merit inside propellant tank
Can, to propellant implementation management entirely, reliability is high, structural strength is high, operation on orbit is applied widely
Novel propellant management device.
Propellant management device by open with different embodiment, US4553565A, US4986398A,
US5279323A, ZL200920223125.5 etc. disclose some propellant management devices, and they are the most applicable
In propellant tank.
Such as describing a kind of propellant management device in US4553565A, it mainly includes the most vertical storage
The guide vane of chamber interior wall EDS maps and the hydraulic accumulator being made up of the blade of some radially uniform placements, by this
A little plank frames realize gas-liquid interface and efficiently separate, and wherein guide vane acts primarily as conducting fluid effect, store liquid
Device acts primarily as accumulation liquid effects, and its shortcoming is: suppression liquid sloshing effect is the least, and hydraulic accumulator can carry
The fluid flow of confession is less, and liquid storage content is little, (as tank axially revolves under some extreme operating conditions being likely to occur
Tarnsition velocity is relatively big, backward acceleration is relatively big or lateral acceleration is bigger etc.) enough not gas enclosures cannot be ensured
Liquid storage content；
Describing a kind of propellant management device in US4986398A, it mainly includes parallel tank internal face
The guide vane being distributed and the hydraulic accumulator being made up of interior Outer Taper and upper and lower collector assembly, wherein water conservancy diversion leaf
Sheet acts primarily as conducting fluid effect, and hydraulic accumulator realizes Liquid storage by pyramidal structure region, and its shortcoming is:
Suppression liquid sloshing effect is the least, uses screen cloth more, and the fluid flow that hydraulic accumulator can provide is less；
A kind of propellant management device is described, in it mainly includes the most vertical tank in US5279323A
The V-type guide vane of wall distribution and the hydraulic accumulator that is made up of the blade of some radially uniform placements, at tank
Lower semisphere position arranges anti-shake dividing plate, and arranges one layer of screen cloth at tank liquid outlet near zone, and its shortcoming exists
In: structure is the most complicated, uses screen cloth more, and suppression liquid sloshing effect is less, only little at tank lower semisphere
Certain suppression liquid sloshing effect is played in subregion；
Describing a kind of propellant management device in ZL200920223125.5, it is mainly by blade and support
Post forms, and its shortcoming is: structural strength is the highest, and the fluid flow that can provide in-orbit is less, liquid storage content
Little, (as relatively big in tank axial-rotation angular velocity, backward acceleration under some extreme operating conditions being likely to occur
Relatively big or lateral acceleration is bigger) cutout phenomenon easily occurs.
Summary of the invention
The technology of the present invention solves problem: overcome the deficiencies in the prior art, it is provided that a kind of for propellant receptacle
Propellant management device in case, it has suppression liquid sloshing function, propellant is carried out full management, knot
Structure is simple, intensity is high, reliability is high, liquid storage content is big, and operation on orbit is applied widely, in-orbit liquid row
Put speed big, ground can be realized simultaneously and repeat the features such as large flow rate filling.
The technical solution of the present invention is: a kind of propellant management device in propellant tank, bag
Include centre strut, guide vane, prop-fan, big blade, storage liquid blade, top board, upper net plate, on
Support plate, small column, skeleton, lower platen, lower net plate and lower carrier plate；
Centre strut is cylindrical tube structure, and its shell of column outer wall is evenly distributed with mounting structure vertically, respectively pacifies
Not contacting between assembling structure, described mounting structure is the multiple rectangles installation along the radially uniform distribution of centre strut
Seam；
Guide vane is the thin-walled slab construction of middle part hollow out, including cylindrical segmental arc and interior straight plate section；External arc
Gap is there is, for conducting fluid between section and tank internal face；Interior straight plate section has several and centre strut
On rectangle the rectangular prong that matches of seam is installed, be connected with the fixing of centre strut for realizing guide vane；
Prop-fan is thin-wall rectangular slab construction, has several and center in the side of its rectangular flat structure
Rectangle on pillar installs the rectangular prong that seam matches, for realizing the fixing of prop-fan and centre strut
Connect；
Big blade is thin-walled slab construction, and multiple through hole that has been dislocatedly distributed on flat board；Big blade includes cylindrical
Segmental arc and interior straight plate section；Gap is there is greatly between blade cylindrical segmental arc and tank internal face；Interior straight section position has
Several install, with the rectangle on centre strut, the rectangular prong that seam matches, and are used for realizing big blade and center
The fixing connection of pillar；
Guide vane, prop-fan, big blade be the most radially fixed to be arranged on centre strut thus forms one
Overall structure, described overall structure is fixedly mounted on top board by centre strut；
Store liquid blade be fixedly mounted on top board, top board, upper net plate, upper supporting plate, small column, skeleton,
Lower platen, lower net plate and lower carrier plate fixedly mount the most successively thus form an overall structure, i.e. store
Collection liquid module；
Skeleton is the cylinder-like structure that lateral wall has annular recess, including upper square position, middle cylinder and lower flat
Dish；Multiple through hole is all had on top board, upper supporting plate, lower platen and lower carrier plate；Top board, upper net plate and on
Support plate is sequentially placed into above square position, and the edge of the edge of the edge of top board, upper net plate and upper supporting plate is equal
Fix with described upper square position and be connected；
Lower platen, lower net plate and lower carrier plate are sequentially placed into below lower square position, and the edge of lower platen, lower net plate
Edge and the edge of lower carrier plate is all fixing with described upper square position is connected.
The walled thickness of described guide vane, prop-fan and big blade is 0.5mm～1.5mm；
Radially even on sidewall between two mounting structures of described centre strut multiple through hole is distributed.
Through hole on through hole on described upper supporting plate, the through hole on lower platen, lower carrier plate and leading on top board
Hole one_to_one corresponding.
Described upper net plate and lower net plate are titanium alloy material.
The installing hole matched with small column it is provided with on described upper supporting plate.
Angle between mounting plane and the described big blade mounting plane of described guide vane be 30 °～
60°。
The Circular plate structure of band boss centered by described top board, Circular plate structure uniformly has through hole, described convex
It is installed with column type hollow pipe on platform, the latter half outer wall of column type hollow pipe is the most uniformly opened
There is mounting groove.
Described storage liquid blade is sector flat plate structure, and described sector flat plate structure is evenly distributed with multiple through hole,
Store liquid blade and coordinate installation with the mounting groove of top board.
Described prop-fan is identical with big blade quantity, and is installed in same plane, prop-fan and great Ye
Contact with each other between the interior straight section position of sheet.
The present invention compared with prior art has the beneficial effect that
(1) propellant management device and described in US4553565A, US4986398A and US5279323A
Comparing, present configuration is simpler, use big blade plank frame, and arranges at big blade and be dislocatedly distributed
Through hole, had both obtained good suppression liquid sloshing effect, the most beneficially liquid communication, and had reached loss of weight
Effect.
(2) present invention does not use the band of the vulnerable to pollution described in US4986398A and US5279323A
There are catcher and a bubble trap of large area mesh sheet, thus the present invention novel propellant management device reliability
Higher.
(3) with US4553565A and ZL200920223125.5 described in propellant management device compared with,
The present invention uses guide vane and the structure of accumulation liquid module, and structural strength is bigger, it is achieved complete to propellant
Management, operation on orbit reliability is higher, and the most available fluid flow is bigger, and liquid storage content is bigger, in-orbit
The work scope of application is the most extensive, even if under some extreme operating conditions being likely to occur, such as tank axial-rotation
Angular velocity is relatively big, backward acceleration is relatively big or lateral acceleration relatively big when, can ensure enough
The not liquid storage content of gas enclosure.
(4) with US4986398A described in propellant management device compared with, the novel propellant tube of the present invention
Reason device mesh sheet usage amount is few and distribution is concentrated, and easily realizes ground and repeats large flow rate filling and discharge function.
Accompanying drawing explanation
Fig. 1 is the sectional view of the novel propellant management device of the present invention；
Fig. 2 is the isometric view of the novel propellant management device of the present invention；
Fig. 3 is the explosive view of accumulation liquid module in the present invention；
Fig. 4 is the structural representation of guide vane in the present invention；
Fig. 5 is the structural representation of big blade in the present invention；
Fig. 6 is the structural representation of top board in the present invention；
Fig. 7 is the structural representation of skeleton in the present invention.
Detailed description of the invention
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, the invention provides a kind of propellant management device in propellant tank, bag
Include centre strut 1, guide vane 2, prop-fan 3, big blade 4, store liquid blade 5, top board 6,
Upper net plate 7, upper supporting plate 8, small column 9, skeleton 10, lower platen 11, lower net plate 12, lower carrier plate 13；
Described upper net plate 7 and lower net plate 12 are titanium alloy material.
As in figure 2 it is shown, centre strut 1 is cylindrical tube structure, its shell of column outer wall is evenly distributed with vertically
Mounting structure, does not contacts between each mounting structure, and described mounting structure is along radially uniform point of centre strut 1
Multiple rectangles of cloth install seam；Guide vane 2, prop-fan 3, big blade 4 is the most radially fixed is arranged on
On centre strut 1 thus form an overall structure, described overall structure is fixedly mounted by centre strut 1
On top board 6；Described guide vane 2, prop-fan 3 are identical with big blade 4 quantity, and pillar leaf
Sheet 3 and big blade 4 are installed in same plane, straight plate section 42 in prop-fan 3 and the second of big blade 4
Between contact with each other, the angle between mounting plane and described big blade 4 mounting plane of guide vane 2 is
30 °～60 °；The walled thickness of described guide vane 2, prop-fan 3 and big blade 4 be 0.5mm～
1.5mm；Liquid sloshing all can be played suppression and make by described guide vane 2, prop-fan 3 and big blade 4
With；Radially even on sidewall between two mounting structures of described centre strut 1 multiple through hole is distributed,
Liquid communication in newel, and be easy to when filling discharge the gas of centre strut 1 inner chamber.
It is fixedly mounted on top board 6 as it is shown on figure 3, store liquid blade 5；Top board 6, upper net plate 7,
Upper supporting plate 8, small column 9, skeleton 10, lower platen 11, lower net plate 12, lower carrier plate 13 depend on from top to bottom
Secondary fixed installation thus form an overall structure, i.e. accumulation liquid module, described accumulation liquid module is used for
Accumulation and collection liquid, provide sufficient and not gas enclosure propellant for propellant tank liquid outlet.
As shown in Figure 4, guide vane 2 is the thin-walled slab construction of middle part hollow out, including the first cylindrical segmental arc
Straight plate section 22 in 21 and first；There is gap between first cylindrical segmental arc 21 and tank internal face 14, use
In conducting fluid；In first, straight plate section 22 has several to match with the rectangle installation seam on centre strut 1
Rectangular prong, be connected with the fixing of centre strut 1 for realizing guide vane 2.
As it is shown in figure 5, big blade 4 is thin-walled slab construction, and multiple through hole that has been dislocatedly distributed on flat board,
For suppressing liquid sloshing, reach to alleviate the effect of weight simultaneously；Big blade 4 includes the second cylindrical segmental arc 41
With second in straight plate section 42；Between existing between blade 4 second cylindrical segmental arc 41 and tank internal face 14 greatly
Gap, for conducting fluid；In second, straight plate section 42 has several to install seam with the rectangle on centre strut 1
The rectangular prong matched, is connected with the fixing of centre strut 1 for realizing big blade 4.
Described prop-fan 3 is thin-wall rectangular slab construction, has several in the side of its rectangular flat structure
With the rectangle on centre strut 1, the rectangular prong that seam matches is installed, is used for realizing prop-fan 3 and center
The fixing connection of pillar 1；Straight plate section 22, prop-fan 3 and big blade 4 in the first of guide vane 2
Second in straight plate section 42 at centre strut 1, form multiple wedged gap region, for accumulation and water conservancy diversion
Liquid, is greatly improved the reliability of novel propellant management device.
As shown in Figure 6, the Circular plate structure of band boss centered by top board 6, Circular plate structure uniformly have logical
Hole, described boss is installed with column type hollow pipe, edge on the latter half outer wall of column type hollow pipe
Axially uniformly have mounting groove；Described storage liquid blade 5 is sector flat plate structure, stores liquid blade 5 top board 6
Mounting groove coordinate install；Store and be evenly distributed with multiple through hole in the described sector flat plate structure of liquid blade 5,
Liquid communication and gas in described accumulation liquid module and between storage liquid blade 5 catch；Store liquid leaf
Multiple angle region is formed, for liquid guide flow and accumulation between sheet 5；Store liquid blade 5 and tank internal face
Gap is there is, for conducting fluid between 14.
As it is shown in fig. 7, skeleton 10 has the cylinder-like structure of annular recess for sidewall, including upper square position 101,
Middle cylinder 102 and lower square position 103；On top board 6, upper supporting plate 8, lower platen 11 and lower carrier plate 13
All there is multiple through hole；Top board 6, upper net plate 7 and upper supporting plate 8 are sequentially placed into above square position 101, and
The edge of the edge of top board 6, the edge of upper net plate 7 and upper supporting plate 8 is all fixed with described upper square position 101
Connect；Lower platen 11, lower net plate 12 and lower carrier plate 13 are sequentially placed into below lower square position 103, and under press
The edge of the edge of plate 11, the edge of lower net plate 12 and lower carrier plate 13 is all fixed with described upper square position 101
Connect.
Through hole on through hole on described upper supporting plate 8, the through hole on lower platen 11, lower carrier plate 13 and upper pressure
Through hole one_to_one corresponding on plate 6.
It is provided with, on described upper supporting plate 8, the installing hole matched with small column 9, described accumulation liquid can be improved
The structural strength of body assembly, as shown in Figure 3.
The operation principle of the present invention is:
The novel propellant management device of the present invention is usually located at inside propellant tank, and described big blade 4 is radially
It is evenly distributed on centre strut 1, acts primarily as the effect of suppression liquid sloshing.For improving, liquid sloshing is pressed down
Make of and reach to alleviate weight effects, big blade 4 is provided with several through holes being interspersed.Separately
Outward, liquid sloshing all can be played certain inhibitory action by described guide vane 2 and prop-fan 3.
For realizing more efficiently under microgravity environment, propellant being managed entirely, the novel propelling of the present invention
Agent managing device devises two main flow-guiding channels.Wherein one is described guide vane 2 and tank inwall
The flow-guiding channel that face 14 is formed, another is to exist at described guide vane 2, prop-fan 3 and big blade 4
The wedged gap flow-guiding channel formed at centre strut 1, is greatly enhanced the present invention novel Propellant Management dress
The reliability put and fluid transmission speed.It addition, described big blade 4 cylindrical segmental arc position and tank inwall
There is gap between face 14, there is conducting fluid function, the most described storage liquid blade 5 and tank internal face
Gap is there is, it may have conducting fluid function between 14.
Accumulation liquid module of the present invention is usually located at propellant tank liquid outlet, under microgravity environment by
The wedge angle wedge area formed between described storage liquid blade 5, can be big with accumulation by surface tension driving effect
Quantity of fluid, the most described storage liquid blade 5 is provided with all multi-through holes, it is simple between each wedge angle wedge area mutually
Connection and be easy to catch and bubble that may be present in being expelled from wedge area, thus realize liquid storage content big,
The function that operation on orbit is applied widely, even if under some extreme operating conditions being likely to occur, such as tank axle
Relatively big to angular velocity of rotation, backward acceleration is relatively big or lateral acceleration relatively big when, can ensure
The liquid storage content of enough not gas enclosures, and providing on the big flow of liquid in-orbit passes through simultaneously for tank liquid outlet
State flow-guiding channel quickly for described accumulation liquid module topping up.
Use the 304L tank of the novel propellant management device of the present invention, store in satellite in-orbit mobile process
In case, liquid sloshing quality at least reduces 25%, and liquid sloshing amplitude at least reduces 30%, and jitter time is at least
Shorten 40%, it is thus achieved that the effect of good suppression liquid sloshing, substantially increase whole star attitude control accuracy；
In the case of lateral acceleration is relatively big, it is possible to the long-time liquid maximum stream flow provided is not less than 24ml/s；Energy
Enough realizing ground and repeat large flow rate filling and discharge function, maximum filling flow is not less than 200ml/s.
The present invention is not disclosed technology and belongs to general knowledge as well known to those skilled in the art.
Claims (10)
1. the propellant management device in propellant tank, it is characterised in that: include centre strut
(1), guide vane (2), prop-fan (3), big blade (4), store liquid blade (5), top board (6),
Upper net plate (7), upper supporting plate (8), small column (9), skeleton (10), lower platen (11), lower net plate (12)
With lower carrier plate (13)；
Centre strut (1) is cylindrical tube structure, and its shell of column outer wall is evenly distributed with mounting structure vertically,
Not contacting between each mounting structure, described mounting structure is multiple along centre strut (1) radially uniform distribution
Rectangle installs seam；
Guide vane (2) is the thin-walled slab construction of middle part hollow out, including the first cylindrical segmental arc (21) and
Straight plate section (22) in one；Gap is there is between first cylindrical segmental arc (21) and tank internal face (14),
For conducting fluid；In first, straight plate section (22) has several to install with the rectangle on centre strut (1)
The rectangular prong that seam matches, is used for fixing connection thing realize guide vane (2) with centre strut (1)；
Prop-fan (3) is thin-wall rectangular slab construction, have in the side of its rectangular flat structure several with
Rectangle on centre strut (1) installs the rectangular prong that seam matches, be used for realizing prop-fan (3) with
The fixing connection of centre strut (1)；
Big blade (4) is thin-walled slab construction, and multiple through hole that has been dislocatedly distributed on flat board；Big blade (4)
Including plate section (42) straight in the second cylindrical segmental arc (41) and second；Big blade (4) second cylindrical segmental arc (41)
And there is gap between (14) in tank internal face；In second, straight plate section (42) has several and centre strut
(1) rectangle on installs the rectangular prong that seam matches, and is used for realizing big blade (4) and centre strut (1)
Fixing connection；
Guide vane (2), prop-fan (3), big blade (4) are the most radially fixed is arranged on centre strut (1)
Going up thus form an overall structure, described overall structure is fixedly mounted on top board by centre strut (1)
(6) on；
Store liquid blade (5) be fixedly mounted on top board (6), top board (6), upper net plate (7), on
Support plate (8), small column (9), skeleton (10), lower platen (11), lower net plate (12) and lower carrier plate (13)
Fixedly mount the most successively thus form an overall structure, i.e. accumulation liquid module；
Skeleton (10) is the cylinder-like structure that lateral wall has annular recess, including upper square position (101), in
Between cylinder (102) and lower square position (103)；Top board (6), upper supporting plate (8), lower platen (11) and
Lower carrier plate all has multiple through hole on (13)；Top board (6), upper net plate (7) and upper supporting plate (8) are successively
It is placed in top, square position (101), and the edge of top board (6), the edge of upper net plate (7) and upper
The edge of plate (8) is all fixing with described upper square position (101) to be connected；
Lower platen (11), lower net plate (12) and lower carrier plate (13) are sequentially placed into lower section, lower square position (103),
And the edge of the edge of lower platen (11), the edge of lower net plate (12) and lower carrier plate (13) is all with described
Upper square position (101) is fixing to be connected.
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: the walled thickness of described guide vane (2), prop-fan (3) and big blade (4) be 0.5mm～
1.5mm。
A kind of propellant management device in propellant tank the most according to claim 1 and 2,
It is characterized in that: radially even on the sidewall between (1) two mounting structure of described centre strut be distributed
Multiple through holes.
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: the through hole on described upper supporting plate (8), the through hole on lower platen (11), lower carrier plate (13)
On through hole and top board (6) on through hole one_to_one corresponding.
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: described upper net plate (7) and lower net plate (12) are titanium alloy material.
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: on described upper supporting plate (8), be provided with the installing hole matched with small column (9).
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: the folder between mounting plane and described big blade (4) mounting plane of described guide vane (2)
Angle is 30 °～60 °.
A kind of propellant management device in propellant tank the most according to claim 1, it is special
Levy and be: the Circular plate structure of band boss centered by described top board (6), Circular plate structure uniformly has through hole,
It is installed with column type hollow pipe, on described boss on the latter half outer wall of column type hollow pipe vertically
Uniformly have mounting groove.
A kind of propellant management device in propellant tank the most according to claim 8, it is special
Levy and be: described storage liquid blade (5) is sector flat plate structure, and described sector flat plate structure is evenly distributed with
Multiple through holes, store liquid blade (5) and coordinate installation with the mounting groove of top board (6).
A kind of propellant management device in propellant tank the most according to claim 1, its
It is characterised by: described prop-fan (3) is identical with big blade (4) quantity, and is installed in same plane,
Contact with each other between straight plate section (42) in the second of prop-fan (3) and big blade (4).
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| CN102518938A (en) * | 2011-12-20 | 2012-06-27 | 北京控制工程研究所 | Flow deflector of plate-type propellant management device |
| CN103950557A (en) * | 2014-04-29 | 2014-07-30 | 北京控制工程研究所 | Hydraulic accumulator for propellant tank in spacecraft |
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| CN201553157U (en) * | 2009-09-28 | 2010-08-18 | 北京控制工程研究所 | Storage tank plate-type propellant management device |
| CN102518939A (en) * | 2011-12-20 | 2012-06-27 | 北京控制工程研究所 | Liquid storage device of plate-type propellant management apparatus |
| CN102518938A (en) * | 2011-12-20 | 2012-06-27 | 北京控制工程研究所 | Flow deflector of plate-type propellant management device |
| CN103950557A (en) * | 2014-04-29 | 2014-07-30 | 北京控制工程研究所 | Hydraulic accumulator for propellant tank in spacecraft |
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| CN104691786A (en) | 2015-06-10 |
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